From what someone told me I could take the D20 system and drop my own material (game world) into it so long as I do not change the system itself. So my questions are.
1: is this true?
2: does WOC get money for this?
3: How much of the material do they own? If I am using their system do I turn over rights of the game world to them?
I need to know this stuff before I throw 10 years of work into this.